Building system and method of constructing a multi-walled structure

A building system comprising:

• at least two supports, each of said supports vertically inserted in an underlying surface in spaced apart relation from one another;
• a support header removably connected to an exposed end of each of said supports;
• each of said support headers including a platform and a mounting hub connected to an undersurface of said platform and disposed in removable, enclosing relation to said exposed end of a corresponding one of said supports;
• a span element extending between adjacent ones of said supports headers and including opposite ends connected in supported relation on an outer surface of said platform;
• said span element further including a lock element including at least one aperture formed therein;
• an engagement segment including a rigid shaft element removably disposed in interconnecting relation between said one aperture of said lock element and a corresponding one of said support headers;
• said span element removably secured between adjacent ones of said support headers;
• a reinforcement panel suspended from said span element, said reinforcement panel being generally stiff and including an at least partially open structure;
• an application panel suspended from said span element in overlapping confronting relation to said reinforcement panel over at least a majority of corresponding surfaces of said reinforcement and application panels, said application panel including a plurality of apertures defined therein;
• and
• a quantity of concrete applied to said application panel in substantially covering relation to said application panel, said reinforcement panel and said supports, and thereby defining a substantially solid wall upon hardening,
• said open structure of said reinforcement panel being dimensioned to facilitate passage of at least some of said quantity of concrete therethrough into said covering relation to at least said application panel, and
• said support header comprising a recess and at least one wall element at least partially defining said recess, said wall element comprising an aperture aligned with said one aperture in said span element and in receiving relation to said rigid shaft element so as to removably secure said span element between adjacent ones of said support headers.